Abstract
In this paper, weanalytically investigated the effect of the angle between primary and auxiliary film cooling holes of an anti-vortex hole on the film cooling effectiveness. The effect of blowing ratio and the mainstream turbulence intensity were also considered. A commercial software, CFX was utilized and the RNG k-ɛ turbulence model was selected as the turbulence model for the analysis. The angle between primary and auxiliary hole was varied from 0 to 75 degrees and the blowing ratio was ranged from 0.25 to 2.0. Four different mainstream turbulence intensities were also considered. Results showed that the anti-vortex film cooling holes performed better than the cylindrical hole. Also, the film cooling effectiveness for the anti-vortex holes were strongly affected by the angle between primary and auxiliary holes of the anti-vortex film cooling hole and the mainstream turbulence intensity.
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